Method for producing propylene by catalytic cracking of hydrocarbons

A catalytic cracking and catalytic cracking technology, which is applied in the production of bulk chemicals, hydrocarbon cracking to produce hydrocarbons, and hydrocarbon oil treatment products, etc., can solve problems such as increasing the processing amount of light hydrocarbons, increasing coke yield, and reducing propylene yield
CN112708450AActive Publication Date: 2021-04-27CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2021-04-27

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Abstract

The invention relates to the field of petroleum refining and petrochemical processing, and discloses a method for producing propylene by catalytic cracking of hydrocarbons, which comprises the following steps: (1) carrying out a first catalytic cracking reaction on heavy raw oil and a first regenerated catalyst to obtain a first oil mixture; (2) carrying out a second catalytic cracking reaction on the light raw oil and a second regenerated catalyst to obtain a second oil agent mixture; and (3) carrying out a third catalytic cracking reaction on the first oil agent mixture and the second oil agent mixture to obtain a third oil agent mixture, and carrying out separation, prerequisite and regeneration for cyclic utilization; wherein the mass ratio of the heavy raw oil to the light raw oil is 0.5-5: 1; the method further comprises the following steps: introducing a first cooling medium into the outlet of the first riser reactor; and / or introducing a second cooling medium into the stripper, and circulating part of the stripped spent catalyst back to the first riser reactor. The method provided by the invention can improve the propylene selectivity and reduce the yields of dry gas and coke.
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Description

technical field

[0001] The invention relates to the fields of petroleum refining and petrochemical processing, in particular to a method for producing propylene by catalytic cracking of hydrocarbons. Background technique

[0002] In 2015, the crude oil processing capacity of domestic catalytic cracking units was about 750 million tons per year, the operating rate of catalytic cracking units was about 70%, and the demand for diesel consumption was at an inflection point. With the further expansion of refining capacity and the popularization of new energy vehicles, the demand for vehicle fuel continues to decline. It is estimated that by 2020, the operating rate of catalytic cracking units will drop to 68%, and gasoline consumption demand will reach an inflection point. A large number of refining units will be idle, and the transformation to the chemical industry will be the way out for refining companies.

[0003] The heavy oil catalytic cracking technology developed by the ...

Claims

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